1887 lines
42 KiB
C
1887 lines
42 KiB
C
/*
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* $Id: rex.c,v 1.55 2007-02-01 08:38:23 bacon Exp $
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*/
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#include <ase/awk/awk_i.h>
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enum
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{
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CT_EOF,
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CT_SPECIAL,
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CT_NORMAL
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};
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enum
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{
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LEVEL_TOP,
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LEVEL_CHARSET,
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LEVEL_RANGE
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};
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enum
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{
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CMD_BOL,
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CMD_EOL,
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CMD_ANY_CHAR,
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CMD_ORD_CHAR,
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CMD_CHARSET,
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CMD_GROUP
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};
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enum
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{
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CHARSET_ONE,
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CHARSET_RANGE,
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CHARSET_CLASS
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};
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enum
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{
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CHARSET_CLASS_PUNCT,
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CHARSET_CLASS_SPACE,
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CHARSET_CLASS_DIGIT,
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CHARSET_CLASS_ALNUM
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};
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#define DEF_CODE_CAPA 512
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#define BOUND_MIN 0
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#define BOUND_MAX (ASE_TYPE_MAX(ase_size_t))
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typedef struct __builder_t __builder_t;
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typedef struct __matcher_t __matcher_t;
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typedef struct __match_t __match_t;
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struct __code_t
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{
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/*ase_byte_t cmd;*/
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short cmd;
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short negate; /* only for CMD_CHARSET */
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ase_size_t lbound;
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ase_size_t ubound;
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};
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struct __builder_t
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{
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ase_awk_t* awk;
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struct
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{
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const ase_char_t* ptr;
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const ase_char_t* end;
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const ase_char_t* curp;
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struct
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{
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int type;
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ase_char_t value;
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} curc;
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} ptn;
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struct
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{
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ase_byte_t* buf;
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ase_size_t size;
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ase_size_t capa;
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} code;
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struct
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{
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int max;
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int cur;
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} depth;
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int errnum;
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};
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struct __matcher_t
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{
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ase_awk_t* awk;
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struct
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{
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struct
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{
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const ase_char_t* ptr;
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const ase_char_t* end;
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} str;
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} match;
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struct
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{
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int max;
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int cur;
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} depth;
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int ignorecase;
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int errnum;
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};
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struct __match_t
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{
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const ase_char_t* match_ptr;
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ase_bool_t matched;
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ase_size_t match_len;
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const ase_byte_t* branch;
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const ase_byte_t* branch_end;
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};
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typedef const ase_byte_t* (*atom_matcher_t) (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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#define NCHARS_REMAINING(rex) ((rex)->ptn.end - (rex)->ptn.curp)
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#define NEXT_CHAR(rex,level) \
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do { if (__next_char(rex,level) == -1) return -1; } while (0)
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#define ADD_CODE(rex,data,len) \
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do { if (__add_code(rex,data,len) == -1) return -1; } while (0)
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#if defined(__sparc) || defined(__sparc__)
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#define GET_CODE(rex,pos,type) __get_code(rex,pos)
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#define SET_CODE(rex,pos,type,code) __set_code(rex,pos,code)
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#else
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#define GET_CODE(rex,pos,type) (*((type*)&(rex)->code.buf[pos]))
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#define SET_CODE(rex,pos,type,code) (GET_CODE(rex,pos,type) = (code))
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#endif
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static int __build_pattern (__builder_t* rex);
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static int __build_pattern0 (__builder_t* rex);
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static int __build_branch (__builder_t* rex);
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static int __build_atom (__builder_t* rex);
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static int __build_charset (__builder_t* rex, struct __code_t* cmd);
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static int __build_occurrences (__builder_t* rex, struct __code_t* cmd);
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static int __build_cclass (__builder_t* rex, ase_char_t* cc);
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static int __build_range (__builder_t* rex, struct __code_t* cmd);
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static int __next_char (__builder_t* rex, int level);
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static int __add_code (__builder_t* rex, void* data, ase_size_t len);
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#if defined(__sparc) || defined(__sparc__)
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static ase_size_t __get_code (__builder_t* builder, ase_size_t pos)
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{
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ase_size_t code;
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ASE_AWK_MEMCPY (builder->awk,
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&code, &builder->code.buf[pos], ASE_SIZEOF(code));
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return code;
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}
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static void __set_code (__builder_t* builder, ase_size_t pos, ase_size_t code)
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{
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ASE_AWK_MEMCPY (builder->awk,
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&builder->code.buf[pos], &code, ASE_SIZEOF(code));
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}
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#endif
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static ase_bool_t __begin_with (
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const ase_char_t* str, ase_size_t len, const ase_char_t* what);
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static const ase_byte_t* __match_pattern (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_branch (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_branch_body (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_branch_body0 (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_atom (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_bol (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_eol (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_any_char (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_ord_char (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_charset (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_group (
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__matcher_t* matcher, const ase_byte_t* base, __match_t* mat);
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static const ase_byte_t* __match_occurrences (
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__matcher_t* matcher, ase_size_t si, const ase_byte_t* p,
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ase_size_t lbound, ase_size_t ubound, __match_t* mat);
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static ase_bool_t __test_charset (
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__matcher_t* matcher, const ase_byte_t* p, ase_size_t csc, ase_char_t c);
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static ase_bool_t __cc_isalnum (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isalpha (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isblank (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_iscntrl (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isdigit (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isgraph (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_islower (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isprint (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_ispunct (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isspace (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isupper (ase_awk_t* awk, ase_char_t c);
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static ase_bool_t __cc_isxdigit (ase_awk_t* awk, ase_char_t c);
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#ifdef DEBUG_REX
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static const ase_byte_t* __print_pattern (const ase_byte_t* p);
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static const ase_byte_t* __print_branch (const ase_byte_t* p);
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static const ase_byte_t* __print_atom (const ase_byte_t* p);
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#endif
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struct __char_class_t
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{
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const ase_char_t* name;
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ase_size_t name_len;
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ase_bool_t (*func) (ase_awk_t* awk, ase_char_t c);
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};
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static struct __char_class_t __char_class[] =
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{
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{ ASE_T("alnum"), 5, __cc_isalnum },
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{ ASE_T("alpha"), 5, __cc_isalpha },
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{ ASE_T("blank"), 5, __cc_isblank },
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{ ASE_T("cntrl"), 5, __cc_iscntrl },
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{ ASE_T("digit"), 5, __cc_isdigit },
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{ ASE_T("graph"), 5, __cc_isgraph },
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{ ASE_T("lower"), 5, __cc_islower },
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{ ASE_T("print"), 5, __cc_isprint },
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{ ASE_T("punct"), 5, __cc_ispunct },
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{ ASE_T("space"), 5, __cc_isspace },
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{ ASE_T("upper"), 5, __cc_isupper },
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{ ASE_T("xdigit"), 6, __cc_isxdigit },
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/*
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{ ASE_T("arabic"), 6, __cc_isarabic },
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{ ASE_T("chinese"), 7, __cc_ischinese },
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{ ASE_T("english"), 7, __cc_isenglish },
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{ ASE_T("japanese"), 8, __cc_isjapanese },
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{ ASE_T("korean"), 6, __cc_iskorean },
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{ ASE_T("thai"), 4, __cc_isthai },
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*/
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{ ASE_NULL, 0, ASE_NULL }
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};
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void* ase_awk_buildrex (
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ase_awk_t* awk, const ase_char_t* ptn, ase_size_t len, int* errnum)
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{
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__builder_t builder;
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builder.awk = awk;
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builder.code.capa = DEF_CODE_CAPA;
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builder.code.size = 0;
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builder.code.buf = (ase_byte_t*)
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ASE_AWK_MALLOC (builder.awk, builder.code.capa);
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if (builder.code.buf == ASE_NULL)
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{
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*errnum = ASE_AWK_ENOMEM;
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return ASE_NULL;
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}
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builder.ptn.ptr = ptn;
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builder.ptn.end = builder.ptn.ptr + len;
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builder.ptn.curp = builder.ptn.ptr;
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builder.ptn.curc.type = CT_EOF;
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builder.ptn.curc.value = ASE_T('\0');
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builder.depth.max = awk->rex.depth.max.build;
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builder.depth.cur = 0;
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if (__next_char (&builder, LEVEL_TOP) == -1)
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{
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if (errnum != ASE_NULL) *errnum = builder.errnum;
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ASE_AWK_FREE (builder.awk, builder.code.buf);
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return ASE_NULL;
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}
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if (__build_pattern (&builder) == -1)
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{
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if (errnum != ASE_NULL) *errnum = builder.errnum;
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ASE_AWK_FREE (builder.awk, builder.code.buf);
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return ASE_NULL;
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}
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if (builder.ptn.curc.type != CT_EOF)
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{
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if (errnum != ASE_NULL) *errnum = ASE_AWK_EREXGARBAGE;
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ASE_AWK_FREE (builder.awk, builder.code.buf);
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return ASE_NULL;
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}
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return builder.code.buf;
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}
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int ase_awk_matchrex (
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ase_awk_t* awk, void* code, int option,
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const ase_char_t* str, ase_size_t len,
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const ase_char_t** match_ptr, ase_size_t* match_len, int* errnum)
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{
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__matcher_t matcher;
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__match_t mat;
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ase_size_t offset = 0;
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/*const ase_char_t* match_ptr_zero = ASE_NULL;*/
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matcher.awk = awk;
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/* store the source string */
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matcher.match.str.ptr = str;
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matcher.match.str.end = str + len;
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matcher.depth.max = awk->rex.depth.max.match;
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matcher.depth.cur = 0;
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matcher.ignorecase = (option & ASE_AWK_REX_IGNORECASE)? 1: 0;
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mat.matched = ase_false;
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/* TODO: should it allow an offset here??? */
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mat.match_ptr = str + offset;
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while (mat.match_ptr < matcher.match.str.end)
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{
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if (__match_pattern (&matcher, code, &mat) == ASE_NULL)
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{
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if (errnum != ASE_NULL) *errnum = matcher.errnum;
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return -1;
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}
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if (mat.matched)
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{
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/*
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if (mat.match_len == 0)
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{
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if (match_ptr_zero == ASE_NULL)
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match_ptr_zero = mat.match_ptr;
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mat.match_ptr++;
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continue;
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}
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*/
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if (match_ptr != ASE_NULL) *match_ptr = mat.match_ptr;
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if (match_len != ASE_NULL) *match_len = mat.match_len;
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/*match_ptr_zero = ASE_NULL;*/
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break;
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}
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mat.match_ptr++;
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}
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/*
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if (match_ptr_zero != ASE_NULL)
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{
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if (match_ptr != ASE_NULL) *match_ptr = match_ptr_zero;
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if (match_len != ASE_NULL) *match_len = 0;
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return 1;
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}
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*/
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return (mat.matched)? 1: 0;
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}
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void ase_awk_freerex (ase_awk_t* awk, void* code)
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{
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ASE_AWK_ASSERT (awk, code != ASE_NULL);
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ASE_AWK_FREE (awk, code);
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}
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ase_bool_t ase_awk_isemptyrex (ase_awk_t* awk, void* code)
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{
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const ase_byte_t* p = code;
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ase_size_t nb, el;
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ASE_AWK_ASSERT (awk, p != ASE_NULL);
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nb = *(ase_size_t*)p; p += ASE_SIZEOF(nb);
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el = *(ase_size_t*)p; p += ASE_SIZEOF(el);
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/* an empty regular expression look like:
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* | expression |
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* | header | branch |
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* | | branch header |
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* | NB(1) | EL(16) | NA(1) | BL(8) | */
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return (nb == 1 && el == ASE_SIZEOF(ase_size_t)*4)? ase_true: ase_false;
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}
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static int __build_pattern (__builder_t* builder)
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{
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int n;
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if (builder->depth.max > 0 && builder->depth.cur >= builder->depth.max)
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{
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builder->errnum = ASE_AWK_ERECUR;
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return -1;
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}
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builder->depth.cur++;
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n = __build_pattern0 (builder);
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builder->depth.cur--;
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return n;
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}
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static int __build_pattern0 (__builder_t* builder)
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{
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ase_size_t zero = 0;
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ase_size_t old_size;
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ase_size_t pos_nb, pos_el;
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int n;
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old_size = builder->code.size;
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/* secure space for header and set the header fields to zero */
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pos_nb = builder->code.size;
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ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
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pos_el = builder->code.size;
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ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
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/* handle the first branch */
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n = __build_branch (builder);
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if (n == -1) return -1;
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if (n == 0)
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{
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/* if the pattern is empty, the control reaches here */
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return 0;
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}
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/*CODEAT(builder,pos_nb,ase_size_t) += 1;*/
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SET_CODE (builder, pos_nb, ase_size_t,
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GET_CODE (builder, pos_nb, ase_size_t) + 1);
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/* handle subsequent branches if any */
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while (builder->ptn.curc.type == CT_SPECIAL &&
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builder->ptn.curc.value == ASE_T('|'))
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{
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NEXT_CHAR (builder, LEVEL_TOP);
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n = __build_branch(builder);
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if (n == -1) return -1;
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if (n == 0)
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{
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/* if the pattern ends with a vertical bar(|),
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* this block can be reached. however, such a
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* pattern is highly discouraged */
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break;
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}
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/*CODEAT(builder,pos_nb,ase_size_t) += 1;*/
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SET_CODE (builder, pos_nb, ase_size_t,
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GET_CODE (builder, pos_nb, ase_size_t) + 1);
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}
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/*CODEAT(builder,pos_el,ase_size_t) = builder->code.size - old_size;*/
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SET_CODE (builder, pos_el, ase_size_t, builder->code.size - old_size);
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return 1;
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}
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static int __build_branch (__builder_t* builder)
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{
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int n;
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ase_size_t zero = 0;
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ase_size_t old_size;
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ase_size_t pos_na, pos_bl;
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struct __code_t* cmd;
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old_size = builder->code.size;
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pos_na = builder->code.size;
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ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
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pos_bl = builder->code.size;
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ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
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while (1)
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{
|
|
cmd = (struct __code_t*)&builder->code.buf[builder->code.size];
|
|
|
|
n = __build_atom (builder);
|
|
if (n == -1)
|
|
{
|
|
builder->code.size = old_size;
|
|
return -1;
|
|
}
|
|
|
|
if (n == 0) break; /* no atom */
|
|
|
|
n = __build_occurrences (builder, cmd);
|
|
if (n == -1)
|
|
{
|
|
builder->code.size = old_size;
|
|
return -1;
|
|
}
|
|
|
|
/* n == 0 no bound character. just continue */
|
|
/* n == 1 bound has been applied by build_occurrences */
|
|
|
|
/*CODEAT(builder,pos_na,ase_size_t) += 1;*/
|
|
SET_CODE (builder, pos_na, ase_size_t,
|
|
GET_CODE (builder, pos_na, ase_size_t) + 1);
|
|
}
|
|
|
|
/*CODEAT(builder,pos_bl,ase_size_t) = builder->code.size - old_size;*/
|
|
SET_CODE (builder, pos_bl, ase_size_t, builder->code.size - old_size);
|
|
return (builder->code.size == old_size)? 0: 1;
|
|
}
|
|
|
|
static int __build_atom (__builder_t* builder)
|
|
{
|
|
int n;
|
|
struct __code_t tmp;
|
|
|
|
if (builder->ptn.curc.type == CT_EOF) return 0;
|
|
|
|
if (builder->ptn.curc.type == CT_SPECIAL)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T('('))
|
|
{
|
|
tmp.cmd = CMD_GROUP;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
|
|
n = __build_pattern (builder);
|
|
if (n == -1) return -1;
|
|
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T(')'))
|
|
{
|
|
builder->errnum = ASE_AWK_EREXRPAREN;
|
|
return -1;
|
|
}
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('^'))
|
|
{
|
|
tmp.cmd = CMD_BOL;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('$'))
|
|
{
|
|
tmp.cmd = CMD_EOL;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('.'))
|
|
{
|
|
tmp.cmd = CMD_ANY_CHAR;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('['))
|
|
{
|
|
struct __code_t* cmd;
|
|
|
|
cmd = (struct __code_t*)&builder->code.buf[builder->code.size];
|
|
|
|
tmp.cmd = CMD_CHARSET;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
n = __build_charset (builder, cmd);
|
|
if (n == -1) return -1;
|
|
|
|
ASE_AWK_ASSERT (builder->awk, n != 0);
|
|
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T(']'))
|
|
{
|
|
builder->errnum = ASE_AWK_EREXRBRACKET;
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
else return 0;
|
|
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
ASE_AWK_ASSERT (builder->awk, builder->ptn.curc.type == CT_NORMAL);
|
|
|
|
tmp.cmd = CMD_ORD_CHAR;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
|
|
ADD_CODE (builder, &builder->ptn.curc.value, ASE_SIZEOF(builder->ptn.curc.value));
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int __build_charset (__builder_t* builder, struct __code_t* cmd)
|
|
{
|
|
ase_size_t zero = 0;
|
|
ase_size_t old_size;
|
|
ase_size_t pos_csc, pos_csl;
|
|
|
|
old_size = builder->code.size;
|
|
|
|
pos_csc = builder->code.size;
|
|
ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
|
|
|
|
pos_csl = builder->code.size;
|
|
ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
|
|
|
|
if (builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T('^'))
|
|
{
|
|
cmd->negate = 1;
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
}
|
|
|
|
while (builder->ptn.curc.type == CT_NORMAL)
|
|
{
|
|
ase_char_t c0, c1, c2;
|
|
int cc = 0;
|
|
|
|
c1 = builder->ptn.curc.value;
|
|
NEXT_CHAR(builder, LEVEL_CHARSET);
|
|
|
|
if (c1 == ASE_T('[') &&
|
|
builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T(':'))
|
|
{
|
|
if (__build_cclass (builder, &c1) == -1) return -1;
|
|
cc = cc | 1;
|
|
}
|
|
|
|
c2 = c1;
|
|
if (builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T('-'))
|
|
{
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
if (builder->ptn.curc.type == CT_NORMAL)
|
|
{
|
|
c2 = builder->ptn.curc.value;
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
if (c2 == ASE_T('[') &&
|
|
builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T(':'))
|
|
{
|
|
if (__build_cclass (builder, &c2) == -1)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
cc = cc | 2;
|
|
}
|
|
}
|
|
else cc = cc | 4;
|
|
}
|
|
|
|
|
|
if (cc == 0 || cc == 4)
|
|
{
|
|
if (c1 == c2)
|
|
{
|
|
c0 = CHARSET_ONE;
|
|
ADD_CODE (builder, &c0, ASE_SIZEOF(c0));
|
|
ADD_CODE (builder, &c1, ASE_SIZEOF(c1));
|
|
}
|
|
else
|
|
{
|
|
c0 = CHARSET_RANGE;
|
|
ADD_CODE (builder, &c0, ASE_SIZEOF(c0));
|
|
ADD_CODE (builder, &c1, ASE_SIZEOF(c1));
|
|
ADD_CODE (builder, &c2, ASE_SIZEOF(c2));
|
|
}
|
|
}
|
|
else if (cc == 1)
|
|
{
|
|
c0 = CHARSET_CLASS;
|
|
ADD_CODE (builder, &c0, ASE_SIZEOF(c0));
|
|
ADD_CODE (builder, &c1, ASE_SIZEOF(c1));
|
|
}
|
|
else
|
|
{
|
|
/* invalid range */
|
|
#ifdef DEBUG_REX
|
|
builder->awk->prmfns.dprintf (
|
|
ASE_T("__build_charset: invalid character set range\n"));
|
|
#endif
|
|
builder->errnum = ASE_AWK_EREXCRANGE;
|
|
return -1;
|
|
}
|
|
|
|
/*CODEAT(builder,pos_csc,ase_size_t) += 1;*/
|
|
SET_CODE (builder, pos_csc, ase_size_t,
|
|
GET_CODE (builder, pos_csc, ase_size_t) + 1);
|
|
}
|
|
|
|
/*CODEAT(builder,pos_csl,ase_size_t) = builder->code.size - old_size;*/
|
|
SET_CODE (builder, pos_csl, ase_size_t, builder->code.size - old_size);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __build_cclass (__builder_t* builder, ase_char_t* cc)
|
|
{
|
|
const struct __char_class_t* ccp = __char_class;
|
|
ase_size_t len = builder->ptn.end - builder->ptn.curp;
|
|
|
|
while (ccp->name != ASE_NULL)
|
|
{
|
|
if (__begin_with (builder->ptn.curp, len, ccp->name)) break;
|
|
ccp++;
|
|
}
|
|
|
|
if (ccp->name == ASE_NULL)
|
|
{
|
|
/* wrong class name */
|
|
#ifdef DEBUG_REX
|
|
builder->awk->prmfns.dprintf (
|
|
ASE_T("__build_cclass: wrong class name\n"));
|
|
#endif
|
|
builder->errnum = ASE_AWK_EREXCCLASS;
|
|
return -1;
|
|
}
|
|
|
|
builder->ptn.curp += ccp->name_len;
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
if (builder->ptn.curc.type != CT_NORMAL ||
|
|
builder->ptn.curc.value != ASE_T(':'))
|
|
{
|
|
#ifdef BUILD_REX
|
|
builder->awk->prmfns.dprintf (
|
|
ASE_T("__build_cclass: a colon(:) expected\n"));
|
|
#endif
|
|
builder->errnum = ASE_AWK_EREXCOLON;
|
|
return -1;
|
|
}
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
/* ] happens to be the charset ender ] */
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T(']'))
|
|
{
|
|
#ifdef DEBUG_REX
|
|
builder->awk->prmfns.dprintf (
|
|
ASE_T("__build_cclass: ] expected\n"));
|
|
#endif
|
|
builder->errnum = ASE_AWK_EREXRBRACKET;
|
|
return -1;
|
|
}
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
*cc = (ase_char_t)(ccp - __char_class);
|
|
return 1;
|
|
}
|
|
|
|
static int __build_occurrences (__builder_t* builder, struct __code_t* cmd)
|
|
{
|
|
if (builder->ptn.curc.type != CT_SPECIAL) return 0;
|
|
|
|
switch (builder->ptn.curc.value)
|
|
{
|
|
case ASE_T('+'):
|
|
{
|
|
cmd->lbound = 1;
|
|
cmd->ubound = BOUND_MAX;
|
|
NEXT_CHAR(builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
|
|
case ASE_T('*'):
|
|
{
|
|
cmd->lbound = 0;
|
|
cmd->ubound = BOUND_MAX;
|
|
NEXT_CHAR(builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
|
|
case ASE_T('?'):
|
|
{
|
|
cmd->lbound = 0;
|
|
cmd->ubound = 1;
|
|
NEXT_CHAR(builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
|
|
case ASE_T('{'):
|
|
{
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
|
|
if (__build_range(builder, cmd) == -1) return -1;
|
|
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T('}'))
|
|
{
|
|
builder->errnum = ASE_AWK_EREXRBRACE;
|
|
return -1;
|
|
}
|
|
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __build_range (__builder_t* builder, struct __code_t* cmd)
|
|
{
|
|
ase_size_t bound;
|
|
|
|
/* TODO: should allow white spaces in the range???
|
|
what if it is not in the raight format? convert it to ordinary characters?? */
|
|
bound = 0;
|
|
while (builder->ptn.curc.type == CT_NORMAL &&
|
|
(builder->ptn.curc.value >= ASE_T('0') &&
|
|
builder->ptn.curc.value <= ASE_T('9')))
|
|
{
|
|
bound = bound * 10 + builder->ptn.curc.value - ASE_T('0');
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
}
|
|
|
|
cmd->lbound = bound;
|
|
|
|
if (builder->ptn.curc.type == CT_SPECIAL &&
|
|
builder->ptn.curc.value == ASE_T(','))
|
|
{
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
|
|
bound = 0;
|
|
while (builder->ptn.curc.type == CT_NORMAL &&
|
|
(builder->ptn.curc.value >= ASE_T('0') &&
|
|
builder->ptn.curc.value <= ASE_T('9')))
|
|
{
|
|
bound = bound * 10 + builder->ptn.curc.value - ASE_T('0');
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
}
|
|
|
|
cmd->ubound = bound;
|
|
}
|
|
else cmd->ubound = BOUND_MAX;
|
|
|
|
if (cmd->lbound > cmd->ubound)
|
|
{
|
|
/* invalid occurrences range */
|
|
builder->errnum = ASE_AWK_EREXBRANGE;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __next_char (__builder_t* builder, int level)
|
|
{
|
|
if (builder->ptn.curp >= builder->ptn.end)
|
|
{
|
|
builder->ptn.curc.type = CT_EOF;
|
|
builder->ptn.curc.value = ASE_T('\0');
|
|
return 0;
|
|
}
|
|
|
|
builder->ptn.curc.type = CT_NORMAL;
|
|
builder->ptn.curc.value = *builder->ptn.curp++;
|
|
|
|
if (builder->ptn.curc.value == ASE_T('\\'))
|
|
{
|
|
if (builder->ptn.curp >= builder->ptn.end)
|
|
{
|
|
builder->errnum = ASE_AWK_EREXEND;
|
|
return -1;
|
|
}
|
|
|
|
builder->ptn.curc.value = *builder->ptn.curp++;
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
if (level == LEVEL_TOP)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T('[') ||
|
|
builder->ptn.curc.value == ASE_T('|') ||
|
|
builder->ptn.curc.value == ASE_T('^') ||
|
|
builder->ptn.curc.value == ASE_T('$') ||
|
|
builder->ptn.curc.value == ASE_T('{') ||
|
|
builder->ptn.curc.value == ASE_T('+') ||
|
|
builder->ptn.curc.value == ASE_T('?') ||
|
|
builder->ptn.curc.value == ASE_T('*') ||
|
|
builder->ptn.curc.value == ASE_T('.') ||
|
|
builder->ptn.curc.value == ASE_T('(') ||
|
|
builder->ptn.curc.value == ASE_T(')'))
|
|
{
|
|
builder->ptn.curc.type = CT_SPECIAL;
|
|
}
|
|
}
|
|
else if (level == LEVEL_CHARSET)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T(']'))
|
|
{
|
|
builder->ptn.curc.type = CT_SPECIAL;
|
|
}
|
|
}
|
|
else if (level == LEVEL_RANGE)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T(',') ||
|
|
builder->ptn.curc.value == ASE_T('}'))
|
|
{
|
|
builder->ptn.curc.type = CT_SPECIAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __add_code (__builder_t* builder, void* data, ase_size_t len)
|
|
{
|
|
if (len > builder->code.capa - builder->code.size)
|
|
{
|
|
ase_size_t capa = builder->code.capa * 2;
|
|
ase_byte_t* tmp;
|
|
|
|
if (capa == 0) capa = DEF_CODE_CAPA;
|
|
while (len > capa - builder->code.size) { capa = capa * 2; }
|
|
|
|
if (builder->awk->prmfns.realloc != ASE_NULL)
|
|
{
|
|
tmp = (ase_byte_t*) ASE_AWK_REALLOC (
|
|
builder->awk, builder->code.buf, capa);
|
|
if (tmp == ASE_NULL)
|
|
{
|
|
builder->errnum = ASE_AWK_ENOMEM;
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tmp = (ase_byte_t*) ASE_AWK_MALLOC (builder->awk, capa);
|
|
if (tmp == ASE_NULL)
|
|
{
|
|
builder->errnum = ASE_AWK_ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
if (builder->code.buf != ASE_NULL)
|
|
{
|
|
ASE_AWK_MEMCPY (builder->awk, tmp,
|
|
builder->code.buf, builder->code.capa);
|
|
ASE_AWK_FREE (builder->awk, builder->code.buf);
|
|
}
|
|
}
|
|
|
|
builder->code.buf = tmp;
|
|
builder->code.capa = capa;
|
|
}
|
|
|
|
ASE_AWK_MEMCPY (builder->awk,
|
|
&builder->code.buf[builder->code.size], data, len);
|
|
builder->code.size += len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ase_bool_t __begin_with (
|
|
const ase_char_t* str, ase_size_t len, const ase_char_t* what)
|
|
{
|
|
const ase_char_t* end = str + len;
|
|
|
|
while (str < end)
|
|
{
|
|
if (*what == ASE_T('\0')) return ase_true;
|
|
if (*what != *str) return ase_false;
|
|
|
|
str++; what++;
|
|
}
|
|
|
|
if (*what == ASE_T('\0')) return ase_true;
|
|
return ase_false;
|
|
}
|
|
|
|
static const ase_byte_t* __match_pattern (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p;
|
|
__match_t mat2;
|
|
ase_size_t nb, el, i;
|
|
|
|
p = base;
|
|
nb = *(ase_size_t*)p; p += ASE_SIZEOF(nb);
|
|
el = *(ase_size_t*)p; p += ASE_SIZEOF(el);
|
|
|
|
#ifdef BUILD_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_pattern: NB = %u, EL = %u\n"),
|
|
(unsigned)nb, (unsigned)el);
|
|
#endif
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
for (i = 0; i < nb; i++)
|
|
{
|
|
mat2.match_ptr = mat->match_ptr;
|
|
|
|
p = __match_branch (matcher, p, &mat2);
|
|
if (p == ASE_NULL) return ASE_NULL;
|
|
|
|
if (mat2.matched)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = mat2.match_len;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return base + el;
|
|
}
|
|
|
|
static const ase_byte_t* __match_branch (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
/*
|
|
* branch body (base+sizeof(NA)+sizeof(BL)---+
|
|
* BL=base+sizeof(NA) ---------+ |
|
|
* base=NA ------+ | |
|
|
* | | |
|
|
* |NA(ase_size_t)|BL(ase_size_t)|ATOMS.........|
|
|
*/
|
|
mat->branch = base;
|
|
mat->branch_end = base + *((ase_size_t*)(base+ASE_SIZEOF(ase_size_t)));
|
|
|
|
return __match_branch_body (
|
|
matcher, base+ASE_SIZEOF(ase_size_t)*2, mat);
|
|
}
|
|
|
|
static const ase_byte_t* __match_branch_body (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* n;
|
|
|
|
if (matcher->depth.max > 0 && matcher->depth.cur >= matcher->depth.max)
|
|
{
|
|
matcher->errnum = ASE_AWK_ERECUR;
|
|
return ASE_NULL;
|
|
}
|
|
|
|
matcher->depth.cur++;
|
|
n = __match_branch_body0 (matcher, base, mat);
|
|
matcher->depth.cur--;
|
|
|
|
return n;
|
|
}
|
|
|
|
static const ase_byte_t* __match_branch_body0 (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p;
|
|
/* __match_t mat2;*/
|
|
ase_size_t match_len = 0;
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/* TODO: is mat2 necessary here ? */
|
|
/*
|
|
mat2.match_ptr = mat->match_ptr;
|
|
mat2.branch = mat->branch;
|
|
mat2.branch_end = mat->branch_end;
|
|
*/
|
|
|
|
p = base;
|
|
|
|
while (p < mat->branch_end)
|
|
{
|
|
p = __match_atom (matcher, p, mat);
|
|
if (p == ASE_NULL) return ASE_NULL;
|
|
|
|
if (!mat->matched) break;
|
|
|
|
mat->match_ptr = &mat->match_ptr[mat->match_len];
|
|
match_len += mat->match_len;
|
|
#if 0
|
|
p = __match_atom (matcher, p, &mat2);
|
|
if (p == ASE_NULL) return ASE_NULL;
|
|
|
|
if (!mat2.matched)
|
|
{
|
|
mat->matched = ase_false;
|
|
break; /* stop matching */
|
|
}
|
|
|
|
mat->matched = ase_true;
|
|
mat->match_len += mat2.match_len;
|
|
|
|
mat2.match_ptr = &mat2.match_ptr[mat2.match_len];
|
|
#endif
|
|
}
|
|
|
|
if (mat->matched) mat->match_len = match_len;
|
|
return mat->branch_end;
|
|
}
|
|
|
|
static const ase_byte_t* __match_atom (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
static atom_matcher_t matchers[] =
|
|
{
|
|
__match_bol,
|
|
__match_eol,
|
|
__match_any_char,
|
|
__match_ord_char,
|
|
__match_charset,
|
|
__match_group
|
|
};
|
|
|
|
ASE_AWK_ASSERT (matcher->awk,
|
|
((struct __code_t*)base)->cmd >= 0 &&
|
|
((struct __code_t*)base)->cmd < ASE_COUNTOF(matchers));
|
|
|
|
return matchers[((struct __code_t*)base)->cmd] (matcher, base, mat);
|
|
}
|
|
|
|
static const ase_byte_t* __match_bol (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const struct __code_t* cp;
|
|
|
|
cp = (const struct __code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_AWK_ASSERT (matcher->awk, cp->cmd == CMD_BOL);
|
|
|
|
mat->matched = (mat->match_ptr == matcher->match.str.ptr ||
|
|
(cp->lbound == cp->ubound && cp->lbound == 0));
|
|
mat->match_len = 0;
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __match_eol (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const struct __code_t* cp;
|
|
|
|
cp = (const struct __code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_AWK_ASSERT (matcher->awk, cp->cmd == CMD_EOL);
|
|
|
|
mat->matched = (mat->match_ptr == matcher->match.str.end ||
|
|
(cp->lbound == cp->ubound && cp->lbound == 0));
|
|
mat->match_len = 0;
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __match_any_char (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const struct __code_t* cp;
|
|
ase_size_t si = 0, lbound, ubound;
|
|
|
|
cp = (const struct __code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_AWK_ASSERT (matcher->awk, cp->cmd == CMD_ANY_CHAR);
|
|
|
|
lbound = cp->lbound;
|
|
ubound = cp->ubound;
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/* merge the same consecutive codes */
|
|
while (p < mat->branch_end &&
|
|
cp->cmd == ((const struct __code_t*)p)->cmd)
|
|
{
|
|
lbound += ((const struct __code_t*)p)->lbound;
|
|
ubound += ((const struct __code_t*)p)->ubound;
|
|
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
|
|
#ifdef BUILD_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_any_char: lbound = %u, ubound = %u\n"),
|
|
(unsigned int)lbound, (unsigned int)ubound);
|
|
#endif
|
|
|
|
/* find the longest match */
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
si++;
|
|
}
|
|
|
|
#ifdef BUILD_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_any_char: max si = %u\n"), (unsigned)si);
|
|
#endif
|
|
|
|
if (si >= lbound && si <= ubound)
|
|
{
|
|
p = __match_occurrences (matcher, si, p, lbound, ubound, mat);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __match_ord_char (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const struct __code_t* cp;
|
|
ase_size_t si = 0, lbound, ubound;
|
|
ase_char_t cc;
|
|
|
|
cp = (const struct __code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_AWK_ASSERT (matcher->awk, cp->cmd == CMD_ORD_CHAR);
|
|
|
|
lbound = cp->lbound;
|
|
ubound = cp->ubound;
|
|
|
|
cc = *(ase_char_t*)p; p += ASE_SIZEOF(cc);
|
|
if (matcher->ignorecase) cc = ASE_AWK_TOUPPER(matcher->awk, cc);
|
|
|
|
/* merge the same consecutive codes
|
|
* for example, a{1,10}a{0,10} is shortened to a{1,20}
|
|
*/
|
|
if (matcher->ignorecase)
|
|
{
|
|
while (p < mat->branch_end &&
|
|
cp->cmd == ((const struct __code_t*)p)->cmd)
|
|
{
|
|
if (ASE_AWK_TOUPPER (matcher->awk, *(ase_char_t*)(p+ASE_SIZEOF(*cp))) != cc) break;
|
|
|
|
lbound += ((const struct __code_t*)p)->lbound;
|
|
ubound += ((const struct __code_t*)p)->ubound;
|
|
|
|
p += ASE_SIZEOF(*cp) + ASE_SIZEOF(cc);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (p < mat->branch_end &&
|
|
cp->cmd == ((const struct __code_t*)p)->cmd)
|
|
{
|
|
if (*(ase_char_t*)(p+ASE_SIZEOF(*cp)) != cc) break;
|
|
|
|
lbound += ((const struct __code_t*)p)->lbound;
|
|
ubound += ((const struct __code_t*)p)->ubound;
|
|
|
|
p += ASE_SIZEOF(*cp) + ASE_SIZEOF(cc);
|
|
}
|
|
}
|
|
|
|
#ifdef BUILD_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_ord_char: cc = %c, lbound = %u, ubound = %u\n"),
|
|
cc, (unsigned int)lbound, (unsigned int)ubound);
|
|
#endif
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/* find the longest match */
|
|
if (matcher->ignorecase)
|
|
{
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_ord_char: <ignorecase> %c %c\n"),
|
|
cc, mat->match_ptr[si]);
|
|
#endif
|
|
if (cc != ASE_AWK_TOUPPER (matcher->awk, mat->match_ptr[si])) break;
|
|
si++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_ord_char: %c %c\n"),
|
|
cc, mat->match_ptr[si]);
|
|
#endif
|
|
if (cc != mat->match_ptr[si]) break;
|
|
si++;
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_ord_char: max occurrences=%u, lbound=%u, ubound=%u\n"),
|
|
(unsigned)si, (unsigned)lbound, (unsigned)ubound);
|
|
#endif
|
|
|
|
if (si >= lbound && si <= ubound)
|
|
{
|
|
p = __match_occurrences (matcher, si, p, lbound, ubound, mat);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __match_charset (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const struct __code_t* cp;
|
|
ase_size_t si = 0, lbound, ubound, csc, csl;
|
|
ase_bool_t n;
|
|
ase_char_t c;
|
|
|
|
cp = (const struct __code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_AWK_ASSERT (matcher->awk, cp->cmd == CMD_CHARSET);
|
|
|
|
lbound = cp->lbound;
|
|
ubound = cp->ubound;
|
|
|
|
csc = *(ase_size_t*)p; p += ASE_SIZEOF(csc);
|
|
csl = *(ase_size_t*)p; p += ASE_SIZEOF(csl);
|
|
|
|
#ifdef BUILD_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_charset: lbound = %u, ubound = %u\n"),
|
|
(unsigned int)lbound, (unsigned int)ubound);
|
|
#endif
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
|
|
c = mat->match_ptr[si];
|
|
if (matcher->ignorecase) c = ASE_AWK_TOUPPER(matcher->awk, c);
|
|
|
|
n = __test_charset (matcher, p, csc, c);
|
|
if (cp->negate) n = !n;
|
|
if (!n) break;
|
|
|
|
si++;
|
|
}
|
|
|
|
p = p + csl - (ASE_SIZEOF(csc) + ASE_SIZEOF(csl));
|
|
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_charset: max occurrences=%u, lbound=%u, ubound=%u\n"),
|
|
(unsigned)si, (unsigned)lbound, (unsigned)ubound);
|
|
#endif
|
|
if (si >= lbound && si <= ubound)
|
|
{
|
|
p = __match_occurrences (matcher, si, p, lbound, ubound, mat);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __match_group (
|
|
__matcher_t* matcher, const ase_byte_t* base, __match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const struct __code_t* cp;
|
|
__match_t mat2;
|
|
ase_size_t si = 0, grp_len_static[16], * grp_len;
|
|
|
|
cp = (const struct __code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_AWK_ASSERT (matcher->awk, cp->cmd == CMD_GROUP);
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/*
|
|
* A grouped pattern, unlike other atoms, can match one or more
|
|
* characters. When it is requested with a variable occurrences,
|
|
* the number of characters that have matched at each occurrence
|
|
* needs to be remembered for the backtracking purpose.
|
|
*
|
|
* An array "grp_len" is used to store the accumulated number of
|
|
* characters. grp_len[0] is set to zero always for convenience.
|
|
* grp_len[1] holds the number of characters that have matched
|
|
* at the first occurrence, grp_len[2] at the second occurrence,
|
|
* and so on.
|
|
*
|
|
* Look at the following example
|
|
*
|
|
* pattern: (abc){1,3}x string: abcabcabcxyz
|
|
*
|
|
* grp_len[3] => 9 -----------+
|
|
* grp_len[2] => 6 --------+ |
|
|
* grp_len[1] => 3 -----+ | |
|
|
* grp_len[0] => 0 --+ | | |
|
|
* | | | |
|
|
* abcabcabcxyz
|
|
*/
|
|
|
|
if (cp->ubound < ASE_COUNTOF(grp_len_static))
|
|
{
|
|
grp_len = grp_len_static;
|
|
}
|
|
else
|
|
{
|
|
grp_len = (ase_size_t*) ASE_AWK_MALLOC (
|
|
matcher->awk, ASE_SIZEOF(ase_size_t) * cp->ubound);
|
|
if (grp_len == ASE_NULL)
|
|
{
|
|
matcher->errnum = ASE_AWK_ENOMEM;
|
|
return ASE_NULL;
|
|
}
|
|
}
|
|
|
|
grp_len[si] = 0;
|
|
|
|
mat2.match_ptr = mat->match_ptr;
|
|
while (si < cp->ubound)
|
|
{
|
|
if (mat2.match_ptr >= matcher->match.str.end) break;
|
|
|
|
if (__match_pattern (matcher, p, &mat2) == ASE_NULL)
|
|
{
|
|
if (grp_len != grp_len_static)
|
|
ASE_AWK_FREE (matcher->awk, grp_len);
|
|
return ASE_NULL;
|
|
}
|
|
if (!mat2.matched) break;
|
|
|
|
grp_len[si+1] = grp_len[si] + mat2.match_len;
|
|
|
|
mat2.match_ptr += mat2.match_len;
|
|
mat2.match_len = 0;
|
|
mat2.matched = ase_false;
|
|
|
|
si++;
|
|
}
|
|
|
|
/* increment p by the length of the subpattern */
|
|
p += *(ase_size_t*)(p+ASE_SIZEOF(ase_size_t));
|
|
|
|
/* check the occurrences */
|
|
if (si >= cp->lbound && si <= cp->ubound)
|
|
{
|
|
if (cp->lbound == cp->ubound || p >= mat->branch_end)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = grp_len[si];
|
|
}
|
|
else
|
|
{
|
|
ASE_AWK_ASSERT (matcher->awk, cp->ubound > cp->lbound);
|
|
|
|
do
|
|
{
|
|
const ase_byte_t* tmp;
|
|
|
|
mat2.match_ptr = &mat->match_ptr[grp_len[si]];
|
|
mat2.branch = mat->branch;
|
|
mat2.branch_end = mat->branch_end;
|
|
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_group: GROUP si=%d [%s]\n"),
|
|
(unsigned)si, mat->match_ptr);
|
|
#endif
|
|
tmp = __match_branch_body (matcher, p, &mat2);
|
|
if (tmp == ASE_NULL)
|
|
{
|
|
if (grp_len != grp_len_static)
|
|
ASE_AWK_FREE (matcher->awk, grp_len);
|
|
return ASE_NULL;
|
|
}
|
|
|
|
if (mat2.matched)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = grp_len[si] + mat2.match_len;
|
|
p = tmp;
|
|
break;
|
|
}
|
|
|
|
if (si <= cp->lbound) break;
|
|
si--;
|
|
}
|
|
while (1);
|
|
}
|
|
|
|
}
|
|
|
|
if (grp_len != grp_len_static) ASE_AWK_FREE (matcher->awk, grp_len);
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __match_occurrences (
|
|
__matcher_t* matcher, ase_size_t si, const ase_byte_t* p,
|
|
ase_size_t lbound, ase_size_t ubound, __match_t* mat)
|
|
{
|
|
ASE_AWK_ASSERT (matcher->awk, si >= lbound && si <= ubound);
|
|
/* the match has been found */
|
|
|
|
if (lbound == ubound || p >= mat->branch_end)
|
|
{
|
|
/* if the match for fixed occurrences was
|
|
* requested or no atoms remain unchecked in
|
|
* the branch, the match is returned. */
|
|
mat->matched = ase_true;
|
|
mat->match_len = si;
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise, it checks if the remaining atoms
|
|
* match the rest of the string
|
|
*
|
|
* Let's say the caller of this function was processing
|
|
* the first period character in the following example.
|
|
*
|
|
* pattern: .{1,3}xx string: xxxyy
|
|
*
|
|
* It scans up to the third "x" in the string. si is set
|
|
* to 3 and p points to the first "x" in the pattern.
|
|
* It doesn't change mat.match_ptr so mat.match_ptr remains
|
|
* the same.
|
|
*
|
|
* si = 3 p -----+ mat.match_ptr ---+
|
|
* | |
|
|
* .{1,3}xx xxxyy
|
|
*
|
|
* When the code reaches here, the string pointed at by
|
|
* &mat.match_ptr[si] is tried to match against the remaining
|
|
* pattern pointed at p.
|
|
*
|
|
* &mat.match_ptr[si] ---+
|
|
* |
|
|
* xxxyy
|
|
*
|
|
* If a match is found, the match and the previous match are
|
|
* merged and returned.
|
|
*
|
|
* If not, si is decremented by one and the match is performed
|
|
* from the string pointed at by &mat.match_ptr[si].
|
|
*
|
|
* &mat.match_ptr[si] --+
|
|
* |
|
|
* xxxyy
|
|
*
|
|
* This process is repeated until a match is found or si
|
|
* becomes less than lbound. (si never becomes less than
|
|
* lbound in the implementation below, though)
|
|
*/
|
|
|
|
ASE_AWK_ASSERT (matcher->awk, ubound > lbound);
|
|
|
|
do
|
|
{
|
|
__match_t mat2;
|
|
const ase_byte_t* tmp;
|
|
|
|
mat2.match_ptr = &mat->match_ptr[si];
|
|
mat2.branch = mat->branch;
|
|
mat2.branch_end = mat->branch_end;
|
|
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match occurrences: si=%u [%s]\n"),
|
|
(unsigned)si, mat->match_ptr);
|
|
#endif
|
|
tmp = __match_branch_body (matcher, p, &mat2);
|
|
|
|
if (mat2.matched)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = si + mat2.match_len;
|
|
p = tmp;
|
|
break;
|
|
}
|
|
|
|
if (si <= lbound) break;
|
|
si--;
|
|
}
|
|
while (1);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static ase_bool_t __test_charset (
|
|
__matcher_t* matcher, const ase_byte_t* p, ase_size_t csc, ase_char_t c)
|
|
{
|
|
ase_size_t i;
|
|
|
|
for (i = 0; i < csc; i++)
|
|
{
|
|
ase_char_t c0, c1, c2;
|
|
|
|
c0 = *(const ase_char_t*)p;
|
|
p += ASE_SIZEOF(c0);
|
|
if (c0 == CHARSET_ONE)
|
|
{
|
|
c1 = *(const ase_char_t*)p;
|
|
if (matcher->ignorecase)
|
|
c1 = ASE_AWK_TOUPPER(matcher->awk, c1);
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_charset: <one> %c %c\n"), c, c1);
|
|
#endif
|
|
if (c == c1) return ase_true;
|
|
}
|
|
else if (c0 == CHARSET_RANGE)
|
|
{
|
|
c1 = *(const ase_char_t*)p;
|
|
p += ASE_SIZEOF(c1);
|
|
c2 = *(const ase_char_t*)p;
|
|
|
|
if (matcher->ignorecase)
|
|
{
|
|
c1 = ASE_AWK_TOUPPER(matcher->awk, c1);
|
|
c2 = ASE_AWK_TOUPPER(matcher->awk, c2);
|
|
}
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_charset: <range> %c %c-%c\n"), c, c1, c2);
|
|
#endif
|
|
if (c >= c1 && c <= c2) return ase_true;
|
|
}
|
|
else if (c0 == CHARSET_CLASS)
|
|
{
|
|
c1 = *(const ase_char_t*)p;
|
|
#ifdef DEBUG_REX
|
|
matcher->awk->prmfns.dprintf (
|
|
ASE_T("__match_charset: <class> %c %s\n"),
|
|
c, __char_class[c1].name);
|
|
#endif
|
|
if (__char_class[c1].func (
|
|
matcher->awk, c)) return ase_true;
|
|
}
|
|
else
|
|
{
|
|
ASE_AWK_ASSERT (matcher->awk,
|
|
!"should never happen - invalid charset code");
|
|
break;
|
|
}
|
|
|
|
p += ASE_SIZEOF(c1);
|
|
}
|
|
|
|
return ase_false;
|
|
}
|
|
|
|
static ase_bool_t __cc_isalnum (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISALNUM (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isalpha (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISALPHA (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isblank (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return c == ASE_T(' ') || c == ASE_T('\t');
|
|
}
|
|
|
|
static ase_bool_t __cc_iscntrl (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISCNTRL (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isdigit (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISDIGIT (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isgraph (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISGRAPH (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_islower (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISLOWER (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isprint (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISPRINT (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_ispunct (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISPUNCT (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isspace (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISSPACE (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isupper (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISUPPER (awk, c);
|
|
}
|
|
|
|
static ase_bool_t __cc_isxdigit (ase_awk_t* awk, ase_char_t c)
|
|
{
|
|
return ASE_AWK_ISXDIGIT (awk, c);
|
|
}
|
|
|
|
#ifdef DEBUG_REX
|
|
|
|
void ase_awk_printrex (ase_awk_t* awk, void* rex)
|
|
{
|
|
__print_pattern (rex);
|
|
awk->prmfns.dprintf (ASE_T("\n"));
|
|
}
|
|
|
|
static const ase_byte_t* __print_pattern (const ase_byte_t* p)
|
|
{
|
|
ase_size_t nb, el, i;
|
|
|
|
nb = *(ase_size_t*)p; p += ASE_SIZEOF(nb);
|
|
el = *(ase_size_t*)p; p += ASE_SIZEOF(el);
|
|
|
|
#ifdef DEBUG_REX
|
|
xp_printf (ASE_T("__print_pattern: NB = %u, EL = %u\n"), (unsigned int)nb, (unsigned int)el);
|
|
#endif
|
|
|
|
for (i = 0; i < nb; i++)
|
|
{
|
|
if (i != 0) xp_printf (ASE_T("|"));
|
|
p = __print_branch (p);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __print_branch (const ase_byte_t* p)
|
|
{
|
|
ase_size_t na, bl, i;
|
|
|
|
na = *(ase_size_t*)p; p += ASE_SIZEOF(na);
|
|
bl = *(ase_size_t*)p; p += ASE_SIZEOF(bl);
|
|
#ifdef DEBUG_REX
|
|
xp_printf (ASE_T("__print_branch: NA = %u, BL = %u\n"), (unsigned int) na, (unsigned int)bl);
|
|
#endif
|
|
|
|
for (i = 0; i < na; i++)
|
|
{
|
|
p = __print_atom (p);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __print_atom (const ase_byte_t* p)
|
|
{
|
|
const struct __code_t* cp = (const struct __code_t*)p;
|
|
|
|
if (cp->cmd == CMD_BOL)
|
|
{
|
|
xp_printf (ASE_T("^"));
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
else if (cp->cmd == CMD_EOL)
|
|
{
|
|
xp_printf (ASE_T("$"));
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
else if (cp->cmd == CMD_ANY_CHAR)
|
|
{
|
|
xp_printf (ASE_T("."));
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
else if (cp->cmd == CMD_ORD_CHAR)
|
|
{
|
|
p += ASE_SIZEOF(*cp);
|
|
xp_printf (ASE_T("%c"), *(ase_char_t*)p);
|
|
p += ASE_SIZEOF(ase_char_t);
|
|
}
|
|
else if (cp->cmd == CMD_CHARSET)
|
|
{
|
|
ase_size_t csc, csl, i;
|
|
|
|
p += ASE_SIZEOF(*cp);
|
|
xp_printf (ASE_T("["));
|
|
if (cp->negate) xp_printf (ASE_T("^"));
|
|
|
|
csc = *(ase_size_t*)p; p += ASE_SIZEOF(csc);
|
|
csl = *(ase_size_t*)p; p += ASE_SIZEOF(csl);
|
|
|
|
for (i = 0; i < csc; i++)
|
|
{
|
|
ase_char_t c0, c1, c2;
|
|
|
|
c0 = *(ase_char_t*)p;
|
|
p += ASE_SIZEOF(c0);
|
|
|
|
if (c0 == CHARSET_ONE)
|
|
{
|
|
c1 = *(ase_char_t*)p;
|
|
xp_printf (ASE_T("%c"), c1);
|
|
}
|
|
else if (c0 == CHARSET_RANGE)
|
|
{
|
|
c1 = *(ase_char_t*)p;
|
|
p += ASE_SIZEOF(c1);
|
|
c2 = *(ase_char_t*)p;
|
|
xp_printf (ASE_T("%c-%c"), c1, c2);
|
|
}
|
|
else if (c0 == CHARSET_CLASS)
|
|
{
|
|
c1 = *(ase_char_t*)p;
|
|
xp_printf (ASE_T("[:%s:]"), __char_class[c1].name);
|
|
}
|
|
else
|
|
{
|
|
xp_printf (ASE_T("should never happen - invalid charset code\n"));
|
|
}
|
|
|
|
p += ASE_SIZEOF(c1);
|
|
}
|
|
|
|
xp_printf (ASE_T("]"));
|
|
}
|
|
else if (cp->cmd == CMD_GROUP)
|
|
{
|
|
p += ASE_SIZEOF(*cp);
|
|
xp_printf (ASE_T("("));
|
|
p = __print_pattern (p);
|
|
xp_printf (ASE_T(")"));
|
|
}
|
|
else
|
|
{
|
|
xp_printf (ASE_T("should never happen - invalid atom code\n"));
|
|
}
|
|
|
|
if (cp->lbound == 0 && cp->ubound == BOUND_MAX)
|
|
xp_printf (ASE_T("*"));
|
|
else if (cp->lbound == 1 && cp->ubound == BOUND_MAX)
|
|
xp_printf (ASE_T("+"));
|
|
else if (cp->lbound == 0 && cp->ubound == 1)
|
|
xp_printf (ASE_T("?"));
|
|
else if (cp->lbound != 1 || cp->ubound != 1)
|
|
{
|
|
xp_printf (ASE_T("{%lu,%lu}"),
|
|
(unsigned long)cp->lbound, (unsigned long)cp->ubound);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
#endif
|